transparent stl meshes in rviz

edit

Hello,

i'm using stl-files to visualize a car model in rviz. Unfortunately since upgrade to ROS indigo the windows are not transparent any more. There seems to be a problem with the alpha channel.

The current color setting for the windows is:

  windows.color.a = 0.25;
  windows.color.r = 0.0;
  windows.color.g = 0.0;
  windows.color.b = 0.0;

Any help or maybe some fix or workaround would be appreciated.